A new wearable multichannel magnetocardiogram system with a SERF atomic magnetometer array

Yang, Yanfei; Xu, Mingzhu; Liang, Aimin; Yin, Yan; Ma, Xin; Gao, Yang; Ning, Xiaolin

doi:10.1038/s41598-021-84971-7

Cited by 69 publications

(47 citation statements)

References 29 publications

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“…Among all atomic devices based on the light–atom interaction mechanism, atomic magnetometers (AMs) stand out for their ultra-high sensitivity (reaching sub-fT/Hz 1/2 scale). AMs nowadays have wide applications including bio-magnetic imaging such as magnetoencephalography (MEG) [ 32 , 33 , 34 ] and magnetocardiography (MCG) [ 35 , 36 ]. AMs are classified into single-beam and double-beam configurations.…”

Section: Introductionmentioning

confidence: 99%

Integrated Polarization-Splitting Grating Coupler for Chip-Scale Atomic Magnetometer

Liang

et al. 2022

Biosensors

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Atomic magnetometers (AMs) are widely acknowledged as one of the most sensitive kind of instruments for bio-magnetic field measurement. Recently, there has been growing interest in developing chip-scale AMs through nanophotonics and current CMOS-compatible nanofabrication technology, in pursuit of substantial reduction in volume and cost. In this study, an integrated polarization-splitting grating coupler is demonstrated to achieve both efficient coupling and polarization splitting at the D1 transition wavelength of rubidium (795 nm). With this device, linearly polarized probe light that experienced optical rotation due to magnetically induced circular birefringence (of alkali medium) can be coupled and split into individual output ports. This is especially advantageous for emerging chip-scale AMs in that differential detection of ultra-weak magnetic field can be achieved through compact planar optical components. In addition, the device is designed with silicon nitride material on silicon dioxide that is deposited on a silicon substrate, being compatible with the current CMOS nanofabrication industry. Our study paves the way for the development of on-chip AMs that are the foundation for future multi-channel high-spatial resolution bio-magnetic imaging instruments.

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Section: Introductionmentioning

confidence: 99%

Integrated Polarization-Splitting Grating Coupler for Chip-Scale Atomic Magnetometer

Liang

et al. 2022

Biosensors

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“…The work presented in this paper is informed by the development of atomic optical magnetometers, where the development is focused on different types of Optically Pumped Magnetometers (OPMs) ranging from unshielded RF to zerofield Spin-exchange relaxation free (SERF). OPMs are used in a wide range of applications, such as geosurveying 7 , magnetoencephalography 8 (MEG) or magnetocardiography (MCG) 9 . In these applications, current sources act as coil drivers to provide an adjustable source of a magnetic field.…”

Section: Introductionmentioning

confidence: 99%

“…Compensation coils are used in zero field magnetometers such as SERF magnetometers 9,11 which operate in a low field of ± 20 nT 12 . For this reason, Earth's magnetic field needs to be suppressed.…”

Section: Introductionmentioning

confidence: 99%

Ultra-low noise, bi-polar, programmable current sources

Mrozowski¹,

Chalmers²,

Ingleby³

et al. 2022

Preprint

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We present the design process and implementation of fully open-source, ultra-low noise programmable current source systems in two configurations. Although originally designed as coil drivers for Optically Pumped Magnetometers (OPMs), the device specifications make them potentially useful in a range of applications. The devices feature a bi-directional current range of ± 10 mA and ± 250 mA respectively on three independent channels with 16-bit resolution. Both devices feature narrow 1/f noise bandwidth of 1 Hz, enabling magnetic field manipulation for highperformance OPMs. They exhibit low noise of 146.3 pA/ √ Hz and 4114 pA/ √ Hz which translates to 14.57 ppb/ √ Hz and 16.46 ppb/ √ Hz noise relative to full scale.

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“…In recent years, atomic magnetometers known as optically pumped magnetometers (OPMs) have replaced other MCG devices due to some advantages such as low cost, high sensitivity comparable to SQUIDs, and working at room temperature. [8][9][10] OPMs are based on the Larmor precession of atoms with nonzero angular momentum in a magnetic field. 11 Atomic magnetometers showing sensitivities up to several aT/√Hz 12 and presenting a noninvasive method can be implemented in detecting and localizing heart diseases like myocardial ischemia.…”

Section: Introductionmentioning

confidence: 99%

Myocardial Ischemia Detection by a Sensitive Pump-Probe Atomic Magnetometer

et al. 2022

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Introduction: Magnetocardiography (MCG) based on optical atomic magnetometers has shown promise for detecting heart diseases accurately. Different methods were introduced to improve the sensitivity of detecting magnetic fields during cardiac activity. Methods: In this paper, an optical pump-probe magnetometer operated on the ground-state Hanle effect based on the zero-field level crossing technique was developed and the laser output signal was optimized in an unshielded environment. Then, the optical magnetometer was utilized to record the simulated MCG trace of different stages of myocardial ischemia. Results: The probe output light intensity followed the variation of cardiac magnetic field (MCG trace) generated by Helmholtz coil accurately. Conclusion: Based on the results, the feasibility of our highly sensitive optical magnetometer in tracing showed no change in the P-QRS-T waveform associated with ischemic heart disease (IHD), where P indicates atrial depolarization, QRS is responsible for ventricular depolarization, and T represents ventricular repolarization.

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A new wearable multichannel magnetocardiogram system with a SERF atomic magnetometer array

Cited by 69 publications

References 29 publications

Integrated Polarization-Splitting Grating Coupler for Chip-Scale Atomic Magnetometer

Integrated Polarization-Splitting Grating Coupler for Chip-Scale Atomic Magnetometer

Ultra-low noise, bi-polar, programmable current sources

Myocardial Ischemia Detection by a Sensitive Pump-Probe Atomic Magnetometer

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